CN112556446B - Oil gas condensation recovery system of crude oil tanker and working method thereof - Google Patents
Oil gas condensation recovery system of crude oil tanker and working method thereof Download PDFInfo
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- CN112556446B CN112556446B CN202011442841.XA CN202011442841A CN112556446B CN 112556446 B CN112556446 B CN 112556446B CN 202011442841 A CN202011442841 A CN 202011442841A CN 112556446 B CN112556446 B CN 112556446B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
- F28B1/06—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using air or other gas as the cooling medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B11/00—Controlling arrangements with features specially adapted for condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
Abstract
The invention discloses an oil gas condensation recovery system of a crude oil tanker and a working method thereof. The system passes the separated nitrogen through a circulating compressor and a turbine expander to obtain low-temperature nitrogen, and the VOC gas containing methane is subjected to three-stage heat exchange to be liquefied and stored in a grading manner. The recovery system is suitable for recovering oil gas of a crude oil ship with nitrogen as the cabin sealing gas, has high refrigeration coefficient, avoids crude oil loss in the transport process of the long sea area, improves the economic value and lightens the emission of pollution gas.
Description
Technical Field
The invention belongs to the technical field of oil gas condensation recovery. In particular to an oil gas condensation recovery system of a crude oil tanker and a working method thereof.
Background
Crude oil is a mixture of various liquid hydrocarbons such as alkane, cycloalkane, aromatic hydrocarbon and alkene, and has strong volatility. During crude oil trade, during crude oil transportation, loading and unloading, a large amount of Organic gas (VOC) is volatilized from crude oil, the explosion limit range of oil gas is wide, the oil gas diffusion range is wide, fire explosion accidents caused by the oil gas are caused, oil gas molecules discharged into the atmosphere pollute the environment, photochemical smog is generated, the ozone layer is damaged, and pollution is caused to the ecological environment and serious economic loss is caused.
The oil gas can be recycled by a condensation method, and the method for liquefying and recycling the oil gas is economical and avoids the pollution of the oil gas to the environment. At present, the common oil gas recovery technical device by a condensation method adopts a classic cascade refrigeration process or a cascade refrigeration process: the three refrigeration circulation devices are used for sequentially completing fractional condensation and recovery of oil gas, three compressors, three expansion valves and the like are needed in the three refrigeration circulation devices, pipelines and control systems are complex, processes are complex, a plurality of units are needed, and in addition, the refrigeration circulation systems are not allowed to leak mutually. The self-cascade refrigeration adopts one-stage compression multi-stage refrigeration, the refrigerant is a non-azeotropic mixture working medium, oil gas is condensed in a grading way, although the self-cascade refrigeration is flexible in design, low in cost and high in reliability, the system needs a complex refrigerant, when the working medium leaks, the complex refrigerant cannot be directly supplemented, the mixed working medium needs to be emptied and filled according to the proportion, and the problems of large economic loss and the like can be caused.
Disclosure of Invention
The invention aims to overcome the problems and the defects of the prior art and provide a crude oil tanker oil gas condensation recovery system which has relatively compact system equipment and does not need a separate refrigerant and a working method thereof aiming at efficiently recovering volatile VOC gas.
According to the oil gas condensation recovery system of the crude oil tanker, the nitrogen gas of the capsule-sealing gas is used as the refrigerant, an independent refrigeration cycle device is not needed, the system equipment is relatively compact, the energy consumption is low, the economic benefit is high, a large amount of crude oil gas volatilized when crude oil is stored and transported is effectively reduced, the crude oil loss in the transportation process of the long sea area is avoided, the economic value is improved, and the emission of pollution gas is reduced.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme.
An oil gas condensation recovery system of a crude oil tanker comprises an oil tank 1, wherein the oil tank 1 is sequentially connected with an oil gas pump 5, a buffer tank 7, a dryer 9 and a filter 10 through pipelines, the filter 10 is connected with a first gas inlet A-1 of a first heat exchanger 12 for raw material heat exchange, a first gas outlet A-2 of the first heat exchanger 12 is connected with a first gas-liquid separator 13, a liquid outlet of the first gas-liquid separator 13 is connected with a first storage tank 22, a gas outlet of the first gas-liquid separator 13 is connected with a first gas inlet D-1 of a second heat exchanger 14, a first gas outlet D-2 of the second heat exchanger 14 is connected with a nitrogen gas stripping tower 15, an upper outlet of the nitrogen gas stripping tower 15 is connected with a nitrogen-methane separator 16, an upper outlet of the nitrogen-methane separator 16 is connected with a second gas inlet E-1 of the second heat exchanger 14, the lower outlet of the nitrogen-methane separator 16 is connected with a second storage tank 17, a second gas outlet E-2 of the second heat exchanger 14 is connected with a second gas inlet B-1 of the first heat exchanger 12, the lower outlet of the nitrogen stripping tower 15 is connected with a second gas inlet G-1 of a third heat exchanger 19, and a second gas outlet G-2 of the third heat exchanger 19 is connected with a methane storage tank 18.
The second gas outlet B-2 of the first heat exchanger 12 is connected with a circulating compressor 23, the circulating compressor 23 is connected with a third gas inlet C-1 of the first heat exchanger 12, the third gas outlet C-2 of the first heat exchanger 12 is connected with a first turboexpander 21, and the outlet of the first turboexpander 21 is connected with a third gas inlet F-1 of the second heat exchanger 14; a third gas outlet F-2 of the second heat exchanger 14 is connected with an inlet of a second turbo expander 20, an outlet of the second turbo expander 20 is connected with a first gas inlet H-1 of a third heat exchanger 19, and a first gas outlet H-2 of the third heat exchanger 19 is communicated with a gas outlet of the nitrogen-methane separator 16 and is jointly introduced into a second gas inlet E-1 of the second heat exchanger 14.
Further, the oil tank 1 is also respectively communicated with a pressure transmitter 3, a stop valve 2 and a safety valve 4 through pipelines.
Further, a check valve 6 is further arranged between the oil-air pump 5 and the buffer tank 7, a regulating valve 8 is arranged between the buffer tank 7 and the dryer 9, and a flow meter 11 is arranged between the filter 10 and the first inlet A-1 of the first heat exchanger 12. Wherein the flow meter 11 forms a feedback control system with the regulating valve 8.
Furthermore, the second gas outlet B-2 of the first heat exchanger 12 connected with the circulating compressor 23 is also connected with one end of a control valve 24, and the other end of the control valve 24 is open to the atmosphere.
Further, the circulation compressor 23 is a screw or piston compressor.
Further, the control valve 24 is a bellows cut-off valve.
Further, the first gas-liquid separator 13 is a wire-mesh filter type or cyclone type gas-liquid separator.
Further, the first heat exchanger 12, the second heat exchanger 14, and the third heat exchanger 19 are all multi-flow aluminum plate-fin heat exchangers or stainless steel plate heat exchangers.
The invention relates to a working method of an oil gas condensation recovery system of a crude oil tanker, which comprises the following specific contents and steps:
when the signal value of the pressure transmitter 3 is higher than the preset value, the oil-gas pump 5 is opened, oil gas passes through the check valve 6 and the buffer tank 7, the regulating valve 8 is opened, the oil gas is dewatered by the drier 9 and then passes through the filter 10 to remove impurities, after passing through the filter 10, the gas enters the first air inlet A-1 of the first heat exchanger 12 through the flowmeter 11 and is liquefied to-65 ℃.
Introducing the mixture condensed and liquefied through the first gas outlet A-2 of the first heat exchanger 12 into a first gas-liquid separator 13, introducing the separated liquid into a first storage tank 22 for storage, introducing the separated gas into a first gas inlet D-1 of a second heat exchanger 14 for condensation to-110 ℃, introducing the gas into a nitrogen stripping tower 15 through a first gas outlet D-2 of the second heat exchanger 14, introducing the gas passing through the lower outlet of the nitrogen stripping tower 15 into a second gas inlet G-1 of a third heat exchanger 19, condensing and liquefying to-160 ℃ through the third heat exchanger 19, and introducing the gas into the methane storage tank 18.
Introducing the mixed gas passing through the upper outlet of the nitrogen stripping tower 15 into a nitrogen-methane separator 16 for separation, introducing the gas at the lower outlet of the nitrogen-methane separator 16 into a second storage tank 17, introducing the gas (mainly nitrogen) at the upper outlet of the nitrogen-methane separator 16 into a second gas inlet E-1 of a second heat exchanger 14, introducing the gas passing through the second heat exchanger 14 into a second gas inlet B-1 of a first heat exchanger 12, compressing and boosting the gas passing through a second gas outlet B-2 of a first heat exchanger 12 by a circulating compressor 23, introducing the gas into a third gas inlet C-1 of the first heat exchanger 12, passing through the first heat exchanger 12, expanding and cooling by a first turbo expander 21, introducing into a third gas inlet F-1 of the second heat exchanger 14, expanding and cooling the gas by a second turbo expander 20, and introducing the gas expanded and cooled by the second turbo expander 20 into a first gas inlet H-1 of the third heat exchanger 19, communicating and converging the gas passing through the third heat exchanger 19 and the gas coming out of the upper outlet of the nitrogen-methane separator 16, and introducing the gas and the gas into a second gas inlet E-1 of the second heat exchanger 14 together to perform the circulation.
Further, before the gas passing through the first heat exchanger 12 is passed through the circulation compressor 23, excess nitrogen in the gas is discharged to the atmosphere through the control valve 24.
The technical scheme provided by the invention has the following beneficial effects:
volatile multi-component oil gas and cabin sealing gas, namely nitrogen, in a crude oil cabin sequentially pass through pretreatment equipment and then enter a liquefaction recovery device, extra refrigerant is not needed in the liquefaction recovery device, nitrogen in VOC mixed gas is used as the refrigerant, low-temperature gas is obtained through two-stage nitrogen expansion circulation, and the VOC gas containing methane is liquefied after condensation heat exchange of a heat exchanger. The circulating device has high refrigeration coefficient, can obtain extremely low refrigeration temperature of-160 ℃ and wide refrigeration capacity range of-65 ℃ to-160 ℃, and can realize high stability in a wider variable working condition range. In addition, the VOC oil gas condensation recovery system is relatively compact in equipment, does not need a plurality of compressors and expanders, is low in energy consumption and high in economic benefit, effectively reduces a large amount of crude oil gas volatilized when crude oil is stored and transported, avoids crude oil loss in the transport process of the long sea area, improves economic value and reduces pollution gas emission.
Drawings
Fig. 1 is a schematic configuration diagram of an oil gas condensation recovery system of a crude oil tanker according to the present invention.
The reference numbers in the figures illustrate: 1-an oil tank, 2-a stop valve, 3-a pressure transmitter, 4-a safety valve, 5-an oil-gas pump, 6-a check valve, 7-a buffer tank, 8-a regulating valve, 9-a dryer, 10-a filter, 11-a flowmeter, 12-a heat exchanger, 13-a gas-liquid separator, 14-a heat exchanger, 15-a nitrogen stripping tower, 16-a nitrogen-methane separator, 17-a second storage tank, 18-a methane storage tank, 19-a heat exchanger, 20-a second turbo expander, 21-a first turbo expander, 22-a first storage tank, 23-a circulating compressor and 24-a control valve.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the oil gas condensation recovery system for a crude oil tanker according to the present invention is composed of an oil tank 1, a stop valve 2, a pressure transmitter 3, a safety valve 4, an oil gas pump 5, a check valve 6, a buffer tank 7, a regulating valve 8, a dryer 9, a filter 10, a flowmeter 11, a first heat exchanger 12, a gas-liquid separator 13, a second heat exchanger 14, a nitrogen stripper 15, a nitrogen-methane separator 16, a second storage tank 17, a methane storage tank 18, a third heat exchanger 19, a second turbo expander 20, a first turbo expander 21, a first storage tank 22, a circulation compressor 23, and a control valve 24.
The pressure transmitter 3 is arranged on an oil tank 1 of an oil tanker, the stop valve 2 is communicated with the oil tank 1 through a nitrogen pipeline, and when the reading of the pressure transmitter 3 is lower than a set value, the opening and closing time of the stop valve 2 is controlled according to the reading of the pressure transmitter 3 to supplement nitrogen. The safety valve 4 is communicated with the oil tank through a pipeline, when extreme conditions occur, the pressure transmitter 3 displays that the pressure is too high, the safety valve 4 is automatically opened, the pressure in the oil tank is reduced, potential safety hazards caused by the fact that the pressure in the oil tank is too high are avoided, and when the signal value of the pressure transmitter is within a preset range, the safety valve is not processed. The nitrogen gas is used for supplementing the tank, volatilization of VOC oil gas can be effectively inhibited, the pressure in the oil tank can be in dynamic balance by arranging the pressure transmitter 3 and the stop valve 2, effective recovery of the oil gas is guaranteed, and the safety factor of the oil tank is improved.
The oil tank 1 with the oiled gas pump 5 is connected, oiled gas pump 5 in proper order with check valve 6, buffer tank 7, governing valve 8, desicator 9 and filter 10 are connected, check valve 6 can prevent the refluence of VOC mist, produces harm to equipment. The dryer 9 is used for removing moisture in oil gas, the filter 10 is used for removing impurities, the condition that the condensation process caused by freezing and blocking accidents cannot continue and damage equipment can be avoided through the dryer 9 and the filter 10, and the recovery efficiency is improved. The filter 10 is sequentially connected with the flowmeter 11 and a first gas inlet A-1 for raw material heat exchange of a first heat exchanger 12, a first gas outlet A-2 of the first heat exchanger 12 is connected with the first gas-liquid separator 13, a liquid outlet of the first gas-liquid separator 13 is connected with the first storage tank 22, a gas outlet of the first gas-liquid separator 13 is connected with a first gas inlet D-1 of the second heat exchanger 14, a first gas outlet D-2 of the second heat exchanger 14 is connected with the nitrogen stripper 15, an upper outlet of the nitrogen stripper 15 is connected with the nitrogen-methane separator 16, an upper outlet of the nitrogen-methane separator 16 is connected with a second gas inlet E-1 of the second heat exchanger 14, and a lower outlet of the nitrogen-methane separator 16 is connected with the second storage tank 17, and a second gas outlet E-2 of the second heat exchanger 14 is connected with a second gas inlet B-1 of the first heat exchanger 12, a lower outlet of the nitrogen stripping tower 15 is connected with a second gas inlet G-1 of the third heat exchanger 19, and a second gas outlet G-2 of the third heat exchanger 19 is connected with the methane storage tank 18.
The second air outlet B-2 of the first heat exchanger 12 is sequentially connected with the control valve 24 and the circulating compressor 23, the circulating compressor 23 is connected with the third air inlet C-1 of the first heat exchanger 12, the third air outlet C-2 of the first heat exchanger 12 is connected with the first turbo expander 21, and the outlet of the first turbo expander 21 is connected with the third air inlet F-1 of the second heat exchanger 14. A third air outlet F-2 of the second heat exchanger 14 is connected with an inlet of a second turbo expander 20, an outlet of the second turbo expander 20 is connected with a first air inlet H-1 of the third heat exchanger 19, a first air outlet H-2 of the third heat exchanger 19 is communicated with a gas outlet of the nitrogen-methane separator 16, and the first air outlet H-2 and the gas outlet are jointly introduced into a second air inlet E-1 of the second heat exchanger 14.
The circulating compressor 23 is a screw or piston compressor, the control valve 24 is a bellows stop valve, and the first gas-liquid separator 13 is a wire-mesh filter type or cyclone type gas-liquid separator.
The first heat exchanger 12, the second heat exchanger 14 and the third heat exchanger 19 are all multi-flow aluminum plate-fin heat exchangers or stainless steel plate heat exchangers.
The invention relates to a working method of an oil gas condensation recovery system of a crude oil tanker, which takes the recovery of VOC gas as an example, and the specific working method is as follows: when the pressure transmitter 3 indicates a high pressure, the oil-gas pump 5 and the control valve 8 are opened, the mixed gas flows into the buffer tank 7 through the check valve 6, enters the drier 9 to remove moisture, and the filter 10 removes impurities. After passing through the filter 10, the gas enters a first gas inlet A-1 of a first heat exchanger 12 through a flow meter 11 and is condensed and liquefied to-65 ℃.
Introducing the mixture condensed and liquefied through the first gas outlet A-2 of the first heat exchanger 12 into a first gas-liquid separator 13, introducing the separated liquid into a first storage tank 22 for storage, introducing the separated gas into a first gas inlet D-1 of the second heat exchanger 14 for condensation to-110 ℃, introducing the gas into the nitrogen stripping tower 15 through a first gas outlet D-2 of the second heat exchanger 14, introducing the gas passing through the lower outlet of the nitrogen stripping tower 15 into a second gas inlet G-1 of the third heat exchanger 19, condensing and liquefying the gas passing through the third heat exchanger 19 to-160 ℃, and introducing the gas into the methane storage tank 18.
And introducing the mixed gas passing through the upper outlet of the nitrogen stripping tower 15 into the nitrogen-methane separator 16 for separation, introducing the gas at the lower outlet of the nitrogen-methane separator 16 into the second storage tank 17, introducing the gas (mainly nitrogen) at the upper outlet of the nitrogen-methane separator 16 into the second gas inlet E-1 of the second heat exchanger 14, and introducing the gas passing through the second heat exchanger 14 into the second gas inlet B-1 of the first heat exchanger 12.
With the circulation, the nitrogen circulating in the system will gradually increase, the gas flowing out from the second gas outlet B-2 of the first heat exchanger 12 opens the control valve 24, the excessive nitrogen is discharged to the atmosphere through the control valve 24, the circulation compressor 23 is opened, the gas flows into the third gas inlet C-1 of the first heat exchanger 12 after being compressed and subjected to pressure and temperature rise by the circulation compressor 23, the gas passes through the first heat exchanger 12, passes through the first turbo expander 21, is subjected to turbo expansion and temperature reduction after being subjected to turbo expansion and temperature reduction, then is introduced into the third gas inlet F-1 of the second heat exchanger 14, the gas from the third gas outlet F-2 of the second heat exchanger 14 passes through the second turbo expander 20 for turbine temperature reduction, and the gas subjected to turbine temperature reduction by the second turbo expander 20 is introduced into the first gas inlet H-1 of the third heat exchanger 19, and communicating and converging the gas passing through the third heat exchanger 19 and the gas coming out from the upper outlet of the nitrogen-methane separator 16, and then jointly introducing the gas into a second gas inlet E-1 of the second heat exchanger 14 to perform the circulation, so as to condense the crude oil VOC mixture containing nitrogen.
When liquefaction is finished, the regulating valve 8, the control valve 24, the stop valve 2, the circulating compressor 23 and the oil-gas pump 5 are closed.
The regulating valve 8 and the flowmeter 11 form a feedback control system, when the flowmeter 11 displays that the flow rate is higher, the valve of the regulating valve 8 is adjusted to be smaller, and when the flowmeter 11 displays that the flow rate is lower, the valve of the regulating valve 8 is adjusted to be larger.
Claims (10)
1. An oil gas condensation recovery system of a crude oil tanker comprises an oil tank (1) and is characterized in that the oil tank (1) is sequentially connected with an oil gas pump (5), a buffer tank (7), a dryer (9) and a filter (10) through pipelines, the filter (10) is connected with a first gas inlet (A-1) of a first heat exchanger (12) for raw material heat exchange, a first gas outlet (A-2) of the first heat exchanger (12) is connected with a first gas-liquid separator (13), a liquid outlet of the first gas-liquid separator (13) is connected with a first storage tank (22), a gas outlet of the first gas-liquid separator (13) is connected with a first gas inlet (D-1) of a second heat exchanger (14), a first gas outlet (D-2) of the second heat exchanger (14) is connected with a nitrogen stripping tower (15), an upper outlet of the nitrogen stripping tower (15) is connected with a nitrogen-methane separator (16), an upper outlet of the nitrogen-methane separator (16) is connected with a second gas inlet (E-1) of the second heat exchanger (14), a lower outlet of the nitrogen-methane separator (16) is connected with a second storage tank (17), a second gas outlet (E-2) of the second heat exchanger (14) is connected with a second gas inlet (B-1) of the first heat exchanger (12), a lower outlet of the nitrogen stripper (15) is connected with a second gas inlet (G-1) of the third heat exchanger (19), and a second gas outlet (G-2) of the third heat exchanger (19) is connected with a methane storage tank (18); the second air outlet (B-2) of the first heat exchanger (12) is connected with a circulating compressor (23), the circulating compressor (23) is connected with a third air inlet (C-1) of the first heat exchanger (12), the third air outlet (C-2) of the first heat exchanger (12) is connected with a first turbo expander (21), and the outlet of the first turbo expander (21) is connected with a third air inlet (F-1) of the second heat exchanger (14); and a third gas outlet (F-2) of the second heat exchanger (14) is connected with an inlet of a second turbo expander (20), an outlet of the second turbo expander (20) is connected with a first gas inlet (H-1) of the third heat exchanger (19), and a first gas outlet (H-2) of the third heat exchanger (19) is communicated with a gas outlet of the nitrogen-methane separator (16) and is jointly introduced into a second gas inlet (E-1) of the second heat exchanger (14).
2. The oil and gas condensation recovery system for crude oil tankers according to claim 1, characterized in that the oil tanks (1) are further communicated with a pressure transmitter (3), a stop valve (2) and a safety valve (4) through pipelines, respectively.
3. Oil and gas condensation recovery system for crude oil tankers according to claim 2, characterized in that between the oil and gas pump (5) and the buffer tank (7) there is also arranged a non-return valve (6).
4. Oil and gas condensation recovery system for crude oil tankers according to claim 3, characterized in that a regulating valve (8) is arranged between the buffer tank (7) and the dryer (9).
5. Oil and gas condensation recovery system for crude oil tankers according to claim 4, characterized in that a flow meter (11) is arranged between the filter (10) and the first inlet (A-1) of the heat exchanger number one (12), said flow meter (11) and the regulating valve (8) constituting a feedback control system.
6. The oil and gas condensation recovery system for crude oil tankers according to claim 1, wherein the second gas outlet (B-2) of the first heat exchanger (12) and the recycle compressor (23) is commonly connected to one end of a control valve (24), the other end of the control valve (24) is open to the atmosphere, and the control valve (24) is a bellows cut-off valve.
7. Oil and gas condensation recovery system for crude oil tankers according to claim 1, characterized in that the circulation compressor (23) is a screw or piston compressor.
8. Oil and gas condensation recovery system for crude oil tankers according to claim 1 characterized in that the first gas-liquid separator (13) is a wire mesh filtration or cyclone gas-liquid separator.
9. The oil and gas condensation recovery system for crude oil tankers according to claim 1, characterized in that the first heat exchanger (12), the second heat exchanger (14) and the third heat exchanger (19) are all multi-flow aluminum plate fin heat exchangers or stainless steel plate heat exchangers.
10. A method of operating an oil and gas condensate recovery system for a crude oil tanker according to claim 5, characterized in that the specific contents and steps are as follows:
when the signal value of the pressure transmitter (3) is higher than a preset value, the oil-gas pump (5) is opened, oil gas passes through the check valve (6) and the buffer tank (7), the regulating valve (8) is opened, the oil gas is dewatered by the drier (9) and then is subjected to impurity removal by the filter (10), after the oil gas passes through the filter (10), the gas enters the first gas inlet (A-1) of the first heat exchanger (12) through the flowmeter (11), and is condensed and liquefied to-65 ℃;
introducing the mixture condensed and liquefied through a first gas outlet (A-2) of the first heat exchanger (12) into a first gas-liquid separator (13), introducing the separated liquid into a first storage tank (22) for storage, introducing the separated gas into a first gas inlet (D-1) of a second heat exchanger (14), condensing to-110 ℃, introducing the gas into a nitrogen stripping tower (15) through a first gas outlet (D-2) of the second heat exchanger (14), introducing the gas passing through a lower outlet of the nitrogen stripping tower (15) into a second gas inlet (G-1) of a third heat exchanger (19), condensing and liquefying to-160 ℃ through the third heat exchanger (19), and introducing the gas into the methane storage tank (18);
introducing the mixed gas passing through the upper outlet of the nitrogen stripping tower (15) into a nitrogen-methane separator (16) for separation, introducing the gas passing through the lower outlet of the nitrogen-methane separator (16) into a second storage tank (17), introducing the gas passing through the upper outlet of the nitrogen-methane separator (16) into a second gas inlet (E-1) of a second heat exchanger (14), introducing the gas passing through the second heat exchanger (14) into a second gas inlet (B-1) of a first heat exchanger (12), compressing and boosting the gas passing through a second gas outlet (B-2) of a first heat exchanger (12) by a circulating compressor (23), introducing the gas into a third gas inlet (C-1) of the first heat exchanger (12), passing through the first heat exchanger (12), expanding and cooling by a first turbo expander (21), introducing into a third gas inlet (F-1) of the second heat exchanger (14), and the gas is expanded and cooled by a second turbo expander (20), the gas expanded and cooled by the second turbo expander (20) is introduced into a first gas inlet (H-1) of a third heat exchanger (19), the gas passing through the third heat exchanger (19) is communicated and converged with the gas coming out from an upper outlet of the nitrogen-methane separator (16), and the gas are introduced into a second gas inlet (E-1) of a second heat exchanger (14) together to perform the circulation.
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| CN102093921A (en) * | 2011-01-20 | 2011-06-15 | 中国海洋石油总公司 | Offshore natural gas liquefying method and device |
| CN103697659A (en) * | 2013-12-23 | 2014-04-02 | 中空能源设备有限公司 | Device and method for manufacturing liquefied natural gas and hydrogen-rich products out of high methane gas |
| CN104930815A (en) * | 2015-06-16 | 2015-09-23 | 上海交通大学 | Marine natural gas liquefaction and NGL recycling system and application |
| CN105737516A (en) * | 2016-04-18 | 2016-07-06 | 中国寰球工程公司 | System and method for liquefying natural gas by mixed refrigerant precooling and nitrogen expansion |
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